GN 20

Stelvoeten, stelelementen

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Omschrijving

1Specification

Types

  • Type A: without mounting holes
  • Type B: with mounting holes

Spindle, adjustable sleeve, foot plate

  • Stainless Steel AISI 304
  • turned

Seals, blue, FDA compliant

Sealing ring

NBR, hardness 70 ±5 Shore A

Wiper

TPU, hardness 95 ±5 Shore A

Joint sealing ring

H-NBR, hardness 85 ±5 Shore A

Bottom seal

Silicon, hardness 85 ±5 Shore A

2Information

GN 20 hygienic levelling feet are certified according to 3-A Sanitary Standard, Inc. guidelines and are intended for use in hygiene areas. In addition, the version with mounting holes (type B) is certified according to EHEDG guidelines.

The bottom seal protects the area beneath the foot plate from dirt. For this, the foot must be screwed on using the mounting holes and compressed accordingly. Hygienic fastenings and the correct position of the mounting holes are essential. The sealing ring above the adjustment sleeve enables fastening without dead space. Due to the wiper or the ball seal, the moving components are sealed against the environment.

The high quality finish prevents adherence of dirt and facilitates cleaning.

The values listed in the table for static load capacity refer to a purely vertical load in relation to the leveling foot. Under normal operating conditions bending loads or angular loads are not uncommon and result in a reduction of load capacity, which must be taken into consideration.

3Technical information
  • Stainless Steel characteristics 
4General instructions

Why Hygienic Design?

In the food industry, medical technology and the pharmaceutical industry, product safety and consumer protection are becoming increasingly important. Due to their specific properties, standard parts in Hygienic Design can assist the production process in these sensitive areas and facilitate the manufacture of products with a long shelf life, which are free from preservatives.

Advantages of Hygienic Design

Less and shorter cleaning work (this can be up to 25 % of the production time), therefore

  • more time available for production
  • less fresh water consumption
  • lower energy consumption
  • less cleaning agent required
  • less production of waste water
  • lower total costs and saving of resources

Legal basis of Hygienic Design

EN 1672-2:2009 “Food machinery”

Machines must be able to be cleaned, i.e. they must be designed and constructed so that dirt can be removed with the recommended cleaning methods.

Machinery directive 2006/42/EC

Machines must be designed so that

  • materials can be easily and fully cleaned before each use and
  • no risk of infections or illness is created.

DIN EN ISO 14519:2008-07

Hygiene requirements for the design of machines

DIN EN 1672:2009-07

Food machinery – General design principles – Part 2

5Requirements, design principles

Design requirements for Hygienic Design

Material

  • Non-rusting Stainless Steels
  • FDA and EU compliant plastics and elastomers

Surfaces

  • Surfaces must be able to be cleaned
  • Steps due to appliance configurations which are not aligned must be avoided
  • Seals must be designed so that no gaps occur
  • O-ring grooves must be hygienically designed
  • Contact with the product to be manufactured must be ruled out
  • Corners should preferably have a radius of 6 mm or more

Design / Geometry

The interior and exterior areas of all appliances, components or piping must be self-draining or be able to be drained and easy to clean.

Surface properties and roughness

Easy to clean with Ra < 0.8 μm

 

Design principles for Hygienic Design

EHEDG

  • European Hygienic Engineering & Design Group
  • non-profit European consortium of machine and food manufacturers as well their suppliers, research institutes, universities and government health agencies
  • approximately 45 guidelines
  • examination of products and issue of certificates

3-A Sanitary Standard, Inc.

  • non profit and independent association in the USA
  • three interest groups:public and governmental health agencies, machine and food manufacturers
  • over 70 Sanitary Standards
  • examination of designs and processes, issue of certificates
6Seals, application example

Seals

For the standard parts which are listed in Hygienic Design, seals have the central function of protecting dead spaces, gaps and cracks from the penetration of cleaning fluids or product residues.

For this, a defined pre-tension or pressing of the seals and wipers is necessary for a reliable and permanent seal in the installed condition. Within the Hygienic Design product family, seal installation spaces and seal cross sections are calculated and designed with simulation software, so that the necessary surface compression is achieved on installation and the seal material is not subjected to excess pressure.

A fundamental differentiation can be made between static and moving seals:

Is the static seal, application examples shown below the top faces the mounting surface (sealing ring) and the bottom faces the contact surface (bottom seal), so that the corresponding pressure is achieved by tightening. It should be ensured that all surfaces which make contact with the seal have a surface finish of al least Ra 0.8 µm.

The moving seals on the adjustable sleeve (wiper) and the ball joint (joint sealing ring) of the foot are designed so that they allow adjustment in both height and angle. With these too, the installation space together with the cross section of the seal ensures a gap-free, pre-tensioned seal.

Depending on the version and the type of use, it may be the case that seals may need to be replaced in case of damage or for preventative maintenance. For this, Elesa+Ganter supplies the relevant seals as spare parts or offers these under GN 7600 as standard parts for spare parts.

Mounting example

With the example of a GN 20 Hygienic Design levelling foot, the illustrated design shows how the various seal configurations can be designed.

 
 
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460119106 GN 20-80-M16-175-A
€ 74,67
28 22 904 18 30 80 175 19 35 M 16
460119129 GN 20-80-M16-225-A
€ 80,59
28 22 983 18 30 80 225 19 35 M 16
460119107 GN 20-80-M20-185-A
€ 83,52
32 27 1115 24 47 80 185 24 35 M 20
460119130 GN 20-80-M20-235-A
€ 89,33
32 27 1243 24 47 80 235 24 35 M 20
460119108 GN 20-80-M24-185-A
€ 85,75
36 30 1284 24 67 80 185 29 35 M 24
460119093 GN 20-80-M24-235-A
€ 91,58
36 30 1458 24 67 80 235 29 35 M 24
460119099 GN 20-100-M16-175-A
€ 84,87
28 22 1171 18 30 100 175 19 35 M 16
460119123 GN 20-100-M16-225-A
€ 90,78
28 22 1252 18 30 100 225 19 35 M 16
460119112 GN 20-100-M20-185-A
€ 93,70
32 27 1385 24 47 100 185 24 35 M 20
460119142 GN 20-100-M20-235-A
€ 99,53
32 27 1513 24 47 100 235 24 35 M 20
460119125 GN 20-100-M24-185-A
€ 95,94
36 30 1546 24 67 100 185 29 35 M 24
460119102 GN 20-100-M24-235-A
€ 101,76
36 30 1726 24 67 100 235 29 35 M 24
460119113 GN 20-120-M16-175-A
€ 98,36
28 22 1465 18 30 120 175 19 35 M 16
460119144 GN 20-120-M16-225-A
€ 104,28
28 22 1549 18 30 120 225 19 35 M 16
460119114 GN 20-120-M20-185-A
€ 107,20
32 27 1691 24 47 120 185 24 35 M 20
460119126 GN 20-120-M20-235-A
€ 113,03
32 27 1818 24 47 120 235 24 35 M 20
460119115 GN 20-120-M24-185-A
€ 109,44
36 30 1853 24 67 120 185 29 35 M 24
460119092 GN 20-120-M24-235-A
€ 115,27
36 30 2031 24 67 120 235 29 35 M 24